model airplane airspeed transmitter/receiver-tone only

[vortex00]

I'm interested in constructing a transmitter/rec that transmits to the pilot on the ground thru an earpiece. approx. 1000' range.
The result needed would be:

airspeed slow- higher pitched tone - beep beep beep
at desired speed- steady tone
airspeed high- lower pitched tone - beeep beeep beeep

Airspeed sensor would be by an AOA(angle of attack)vane varying the resistance of a pot.

could someone point me in the right direction?

thank you

Jack
vortex00@yahoo.com

 

[Roff]

I'm interested in constructing a transmitter/rec that transmits to the pilot on the ground thru an earpiece. approx. 1000' range.
The result needed would be:

airspeed slow- higher pitched tone - beep beep beep
at desired speed- steady tone
airspeed high- lower pitched tone - beeep beeep beeep

Airspeed sensor would be by an AOA(angle of attack)vane varying the resistance of a pot.

could someone point me in the right direction?

thank you
Jack
vortex00@yahoo.com

A simple variable-frequency tone would require slightly less weight and size. Just put the pot in a 555 oscillator and use that to amplitude modulate an RF transmitter. If you need beep-beep-beep, you could do that processing on the ground. Of course, it wouldn't require too much more space/weight to do the beeping in the plane.
**broken link removed** has a good 555 tutorial, and also lots of RC info.

 

[vortex00]

Ron,
Thanks for the reply. It will get me started.

I'll look at the small Spy FM Tx if I can find one that gives me about 600-1000'. Rec to be a simple FM receiver on the belt with earpiece.

The real F-4 Phantom had a similar system before the ICs came. I wondered how it was done.

Jack